We have three admins that administer GP and AD, sometimes changes are made that are not disclosed to other admins. I would like to eliminate this issue by having change management procedures put into place and I would like to be able to trace back any changes that we made in AD or GP. Is there any way to do this?
Thank you!

Netwrix has a few products that can handle this for you. I used the Netwrix Auditor for Active Directory Free Community Edition for a year before upgrading to their Auditor platform to monitor even more. Check out their free tools here: https://www.netwrix.com/top_7_freeware_tools.html

Michael (Netwrix) has also been posting a lot of how-to's lately on how to track changes with the tools you have available already.